Slime filter



N0.624,533. Patented May 9, I899.

C. H.- PEAD.

SLIME FILTER.

(Applicafiofi filed May 21,1898.)

(No Model.) 4 Sheets-Sheet L INVENTO/i A 77'0HNEYS 1n: "cams mus c0.vgoro-uruou ausumuwu, D c.

No. 624,533. Patented May 9, I899.

C. H. PEAD.

SLIME FILTER.

Application filed May 21, 1898.) (No Model.) 4 Sheets-Sheet 2.

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/N VENTOI? .4 TTOHNEYS m: beams menus on. momum nn whsm uaron, n. c

Patented May 9, I899. C. H. PEAD.

SLIIIE FILTER.

(Application filed Kay 21, 1898.)

WITNESSES.

IN VE N 70/? A 77'0HNEYS THE uonms PETERS co, Imam-urns. WASHINGTON. g.c.

"0.624593. Patented May 9,1999.

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sun: FILTER. (Application mm Kay 91, was. (No Model.) 4 Sheets-Shoat 4.

I I l l I I r I I I I I. III I 1: I

I I I I "VJ l/V VEN r00 PATENT DFFICE.

CLEMENT HARRY PEAD, OF BOKSBURG, SOUTH AFRIOANiREPUBLIO.

SLIME-FILTER.

SPECIFICATION forming part of Letters Patent No. 624,533, dated May 9,1899.

Application filed May 21,189t3. derialNe. 681,368- No model-I T (110700171, it may 0077100771 Be it k uown that l, CLEMENT HARRY PEAD, aresident of Boksburg, near Johannesburg, South African Republic, haveinvented certain new and useful Improved Slime-Filter Presses, of whichthe following is a specification.

My invention relates to certain apparatus for the separation of liquidsfrom the fine 'stud fitted to its center.

passes.

slimes of gold or other ores.

My apparatus consists of a tank fitted with a hood of conical or anyother convenient form. The sides of the tank project above the point ofattachment of the hood, so as to form an annular space to act as areceptacle forming a launder for discharge of the clear liquid. In thecenter of the hood is an openin g, around which is riveted or bolted aframe or seating arranged to carry a filter composed of one or morelayers of filter-cloth or any other well-known filtering medium. Thefilter is kept in place by means of a protective grid or clamp ofsuitable form and strength to resist the effective pressure from theinterior of the tank. A number of small distribution-pipes set at suchan angle as to cause the slimes to impinge on the under surface of thefilter are connected to the seating of the latter, through which theypass. They are connected to a main distributor, which inturn isconnected with the delivery pipe or column of the slime-pump. One ormore tapershaped plugs or cores constructed of light steel tubes, theirnumber varying according to the size of thetank, pass through the hoodand extend to the bottom of the tank. They taper from about eighteeninches at the top to fifteen inches at the bottom. They are fitted attheir upper ends with a flange to which is attached a shackle. Theirlower ends are closed by means of a dished bottom riveted in place andhaving a strong bolt o'r Each plug or core rests on a seating fitted tothe outside of the hood and through which the plug or core The seatingis attached thereto by type.

easily into the discharge-openi ng, and the discharge-door is drawn uponto its seating or joint by means of the belt or stud on bottom of theplug or core and by its nut. The plugs or cores when in place andholding up the manhole-doors afford an effectual means of resistanceagainst internal pressure.

A special pipe is arranged and fitted to the upper portion of the tankto drain the space forming a launder between the top of the tank and theupper surface of the hood and to conduct the liquid portion which haspassed through the filter to the precipitation-boxes or to waste.

' In the accompanying drawings, Figure 1 is a sectional elevation of myapparatus; Fig. 2, a

Fig. tisa forming a launder O with same on the outside. An opening isprovided in the center of the hood, around which is secured the seating0 for the purpose of carrying the filter D. The filter is fixed by meansof the clamp or protective grid E, which grid has radiating arms restingon top of the filter, as is shown in Fig. 1, one of the arms being shownin section. Through the seating 0 holes are bored to receive smalldistribution-pipes f and connected to the main distributer F, which inturn is connected to the delivery-pipe R of the slime-pump P, as shownin Figs. 1 and 2. The small distribution-pipes fare slightly inclinedfrom the main pipe F up toward the filter, so that the stream of pulpmust impinge against the filter, thus producing a scouring actionandpreventing clogging. The same action is efi'ected by a centraldischarge-distributer G, as shown in Fig. 5. This distributer is fittedwith a baffle-plate G, dished and attached. Whichever distributer isused the discharge is so arranged as to take place as close under thefilter as possible.

H are the plugs or cores fitted with the flange H and shackle H andclosed at the bottom by means of a dished end H carrying the bolt H Theplugs or cores rest on seat too ings J, which are secured to the hood B.In the bottom of the tank and immediately beneath the seating J is adischarge-door L, of the ordinary manhole or other convenient type. Theend of each plug or core H passes easily into the discharge-opening. Thedischargedoor L is fixed by means of the bolt H, which passes throughit. The plugs or cores II when in place therefore act as stays to resistinternal pressure. In order to discharge the residues in a dry state,the discharge-door L and bolts K are removed and the plugs or cores Hwithdrawn by means of overhead tackle. This, owing to the tapered formof the plugs, is an easy operation.

P is the slime-pump, which may be a centrifugal pump or centrifugalpumps in series or any other suitable pump.

R is the delivery-pipe, S the suction-pipe from the treatment-tank, andI a by-pass from the delivery-column to the treatment-tank, to be openedin case the pump stops.

The advantages of my system above the old systems are great andnumerous. First, instead of allowing the slimes to settle from the Watercollected with them after passing the spitzkasten they areimmediatelypumped, together with the water, into the filter-press. As soon as thefilter-tank-is full the water is forced through the filter-screen D(which prevents the escape of the slime) to the space 0, from whence itis drawn away by the drainpipes V, and considerable pressure beingapplied by the pumps the water will be rapidly separated from theslimes. The slimes, still containing sufficient water, can be pumped orgravitated back, as may be advisable, by means of the suction or outletpipe M into the treatment-tanks, where they may be treated as usual.This process may be repeated as often as required.

In separating the slimes from the last wash in the filter-press a doubleor even larger quantity of slimes from a second charge is forced bymeans ofthe pump, as usual, into the filter-press, so that the slimescontained therein have the moisture in them reduced to a minimum tillthey are considered to be in a fit condition (called dry) to be discharged by any suitable method. It will be evident that this process isalmost automatic, which fact is an enormous saving of time in operation.

The filtering medium by which the slimes are separated from theirsolutions is easily renewable without excessive cost.

Having now particularly described and ascertained the nature of myinvention and the manner in which the same is to be performed, I declarethat what I claim is 1. In combination, the closed vessel having afilter at its upper end, a slime-pump and a distributer arranged todischarge the slimes and water upon the filter, said distributer beinglocated at the top of the closed vessel, substantially as described.

2. In combination, the closed vessel, the slime-pump, the distributerconnected therewith and located at the top of the closed chamber, afilter at the top of the chamber and the suction-pipe M extending fromthe lower part of the vessel, substantially as described.

3. In combination, the closed chamber, the filter at the top thereof, apressure-pump, a' pipe leading therefrom to the top of the chamber andthe jet-pipesf to discharge the material onto the filter, substantiallyas described.

4. In combination, the tank A, the hood B covering the same, thefilterat the top of the hood, the inlet-pipe to the filter and the channel 0about the hood to receive the filtered solution, substantially asdescribed.

5. In combination, the tank A, the hood 13 covering the same and havingsloping sides, the filter at the top of the hood, the inlet-pipe 'to thefilter and the channel 0 about the hood to receive the filteredsolution, substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

CLEMENT HARRY PEAD.

Witnesses:

ROGER PRICE, WALTER ALURACHZELO.

